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    Question

    Which one of the following mineral is the main source of

    Boron in soils
    A Pyrolusite Correct Answer Incorrect Answer
    B Tourmaline Correct Answer Incorrect Answer
    C Magnetite Correct Answer Incorrect Answer
    D Muscovite Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Tourmaline is the main source of boron; Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese; Magnetite is a mineral whose primary component is an iron oxide that contains equal amounts of iron(II) and iron(III); Muscovite is the most common mineral of the mica family.

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